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Note 2 - Securities - Summary of Amortized Costs and Fair Values of Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Amortized cost, available for sale securities	$ 295,699	$ 290,058
Gross unrealized gains, available for sale securities	147	2,033
Gross unrealized losses, available for sale securities	(31,096)	(2,596)
Fair value, available for sale securities	264,750	289,495
Amortized cost, held to maturity securities	77,151	33,441
Gross unrealized gains, held to maturity securities	2	242
Gross unrealized losses, held to maturity securities	(6,661)	(66)
Fair value, held to maturity securities	70,492	33,617
Amortized cost	372,850	323,499
Gross unrealized gains	149	2,275
Gross unrealized losses	(37,757)	(2,662)
Total securities, fair value	335,242	323,112
US Treasury Securities [Member]
Amortized cost, available for sale securities	59,815	39,871
Gross unrealized gains, available for sale securities	0	37
Gross unrealized losses, available for sale securities	(3,559)	(250)
Fair value, available for sale securities	56,256	39,658
US Agency and Mortgage-backed Securities [Member]
Amortized cost, available for sale securities	164,623	177,131
Gross unrealized gains, available for sale securities	120	1,085
Gross unrealized losses, available for sale securities	(16,929)	(1,837)
Fair value, available for sale securities	147,814	176,379
Amortized cost, held to maturity securities	65,302	26,392
Gross unrealized gains, held to maturity securities	0	124
Gross unrealized losses, held to maturity securities	(5,400)	(53)
Fair value, held to maturity securities	59,902	26,463
US States and Political Subdivisions Debt Securities [Member]
Amortized cost, available for sale securities	69,258	71,037
Gross unrealized gains, available for sale securities	27	910
Gross unrealized losses, available for sale securities	(10,604)	(509)
Fair value, available for sale securities	58,681	71,438
Amortized cost, held to maturity securities	8,849	7,049
Gross unrealized gains, held to maturity securities	2	118
Gross unrealized losses, held to maturity securities	(1,174)	(13)
Fair value, held to maturity securities	7,677	7,154
Corporate Debt Securities [Member]
Amortized cost, available for sale securities	2,003	2,019
Gross unrealized gains, available for sale securities	0	1
Gross unrealized losses, available for sale securities	(4)	0
Fair value, available for sale securities	1,999	$ 2,020
Amortized cost, held to maturity securities	3,000
Gross unrealized gains, held to maturity securities	0
Gross unrealized losses, held to maturity securities	(87)
Fair value, held to maturity securities	$ 2,913

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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